Saw.



A. C. HUFFSGHMITT.

SAW.

APPLICATION :FILED JULY 1, 1912.

Patented Apr. 15, 1913.

v e I I N VENTOR. AZberCM//jfchmz't f7 www ATTORNEY.

COLUMBIA mam-GRAPH Cu.,WAsH|NGTO'N. D. c.

ALBERT C. HUFFSGHMITT, OF ST. LOUIS, MISSOURI.

SAW.

Specification of Letters Patent.

Patented Apr. 15, 1913.

Application filed .Tilly 1, 1912. l Serial No. 706,970.

T0 all whom t may concern:

Be it known that I, ALBERT C. HUFF- soI-rMrrr, citizen of the UnitedStates, residing at St. Louis, State of Missouri, have invented certainnew and useful Improvements in Saws, of which the following is a full,clear, and exact description, reference being had to the accompanyingdrawings, forming a part hereof.

My invention has relation to improvements in saws; and it consists inthe novel details of construction more fully set forth in thespecification and pointed out in the claims.

In the drawings, Figure 1 is a plan of the saw with my improvements;Fig. 2 is an .enlarged plan of the terminal of the outer arm of theframe, and the end of the blade anchored thereto, parts being brokenaway; Fig. 3 is a section on the line 3 3 of Fig. 2, looking upward;Fig. 4 isa longitudinal section through the blade and cross-sectionthrough the saw-frame on the line 4 4 of Fig. 2; Fig. 5 is an enlargedcombined plan and section of the inner blade-securing member and tensiondevice expanded, and the strap in which the securing member. is mounted;Fig. Gis an edge view of the strap and the hea of the blade-securingmember projecting beyond the same; Fig. 7 is a combined section andelevation of the quick-acting tension device in its contracted position;Fig. 8- is a cross-section on the line 8 8 of Fig. 5; Fig. 9 is across-section on the line 9 9 of Fig. 5; Fig. l0 is a cross-section onthe line 10-10 of Fig. 5; and Fig. 11 is a perspective of the anchorpiece to which the outer end of the saw-blade is secured. j

The object of my invention is to provide a saw from the frame of whichthe blademay be instantly removed and as readily and quickly attachedand proper tension imparted thereto, the invention being specicallydirected to vthe securing and tightening means by which these objectsare respectively accomplished.

The advantages of the invention will be fully apparent from a detaileddescription thereof which is as follows Referring to the drawings, 1represents a conventional butchers saw frame, and 2 the handle thereforas well understood in the art. The outer member or arm a of the frame isprovided with a terminal open slot or slit 3 disposed in the plane ofthe frame, said slot being intersected by a recess 4 inclined slightlyoutward and to the axis of the blade as presently to be seen. Looselembracing the outer edge and side of the member a, andpfree to slidethereover is a channel piece or anchor 5, the sides of the channel beingprovided with longitudinally disposed slots s, s, traversed by the endsof a' pin 6 passed through the arm a, one of the sides (the outer one)of the channel being formed into an extension or lobe 5 whose inner.face has projecting therefrom a bladesecuring or anchoring pin 6 adaptedto be received by the recess 4 when the end of the bllai passed oversaid pin is received by the s ol Secured to the freeend of the oppositearm a of the frame is a U-shaped strap or clamp S, a suflicient space orpassage-way being left between the end of the arm a. and the bend insaid strap to receive an adjustable stem 7 whose outer screw-threadedportion 7 projects outwardly from the arm a', and whose opposite endterminates in a fiat head 8 enveloped by the strap S and projectingtoward the arm a. One of the faces of the head 8 is recessed so as toleave a central face or section m offset from the terminal face m, thebottom section m being in turn offset from the section m. The section mis provided with a stud 9 about which swings a latch L of a thicknessequal to the offset between the sections m, m, whereby the outer face ofthe latch is Hush with said section m. The section m is provided with apin l0 adapted to be passed through a hole at the inner end of the blade11, the thickness of the blade corresponding substantially to the depthof the offset between the faces m, m', said offset being improvisedspecially to accommodate the blade as the latter is passed over the pinl0, after which the hooked end of the latch is swung over the pin tohold the blade in place. The blade being passed with one end over thepin 6 of the slide 5 and forced into the slot 3, and the opposite end ofthe blade being secured to the -pin 10 with the locking latch swung overthe pin, it now remains to tighten or impart the proper stretch ortension to the blade, this being accomplished quickly by the followingmechanism As stated before, the stem 7 (which is polygonal incrosssection) with its head 8 is freely adjustable in the strap S, andwhen the inner end of the blade is being passed over the'pin 10, thelatter is adjusted up to and opposite the hole in the blade by a turn ortwo of the nut 12 operating over the outer screwthreaded terminal 7 ofthe stem, said nut bearing against the adjacent end of a sleevev orcasing 13 freely rotatable about the stem, the opposite end of thesleeve being provided with a head 13 adapted to be seized by a wrench orequivalent tool. Interposed between the head 13 and the strap S, andfree to slide along the stem is a washer 14, said washer however beingincapable of rotation about the stem, the passage-way of the washerbeing polygonal to conform to the cross-section of the stem. The washeris provided with two peripheral projections or shoulders t, t, betweenwhich plays a lug or linger 15 formed on the outer edge of the head 13',said shoulders arresting' the linger and hence limiting the rotation ofthe sleeve 13 in either direction. Formed on or secured to the inside ofthe sleeve (and free to rotate with the sleeve about the stem 7) is aspiral formation or thread 16 having a high-pitch with which cooperatesa ring 17 having a similar formation 16 said ring having however apolygonal passageway for the reception of the polygonal stem 7, so thatthe ring while free to traverse the stem longitudinally can not rotatethereon. rlhe spiral formations between the members 16 and 17 being ofhigh pitch, it is apparent that with a turn of the sleeve 13 in onedirection4 through an arc defined by the space between the shoulders t,t, thering 17 will be forced outwardly until the spiral formations ofthe part-s 16, 17 are brought practically end to end (Fig. 5), and by aturn of the sleeve in the opposite direction, the ring 17 will be freeto return to its original position, or toward the head 13 (Fig. 7). Thering 17 thus operates as a non-rotatable nut, merely sliding along thestem 7 in either direction (according to the direction of rotation ofthe sleeve), the throw of the ring being considerable for a very slightturn of the sleeve 13 on account of the high pitch of the spirals 16,16. It is obvious therefore that by a slight turn of the sleeve 13 inproper direction, and after the blade has been attached to the pins 6and 10, the ring 17 may be quickly forced outwardly against the nut 12and the proper tension or stretch may be imposed on the blade. A turn ofthe casing in the opposite direction (between the limits of theshoulders t, 25,) will loosen the blade, the ring 17 being free to slidein the opposite direct-ion or away from the adjusting nut l2. Of course,when the sleeve 13 is turned so as to drive the ring 17 outwardly, thelatter engages the nut 12, forcing it and the stem by which it iscarried outwardly thereby pulling taut the blade 11 attached to saidstem (or rather the head 8 thereof).v The lengths of the formations 16,16', are such that with a turn of the sleeve through an arc determinedby the space between the shoulders t, t, (which are engaged by thefinger 15 on the head 13 of the sleeve) the ring 17 will be drivenoutwardly until the free ends of the formations are broughtsubstantially into abutting relation (Fig. 5) by which time the dangerof the ring 17 slipping back to its inner position under the tension ofthe blade has passed; and the only way to release thc ring and cause thesame to slide back or inwardly to relieve the tension on the blade, isto rotate the sleeve in the opposite direction. The tension on the bladebeing thus relieved, the blade can be readily detached by a properloosening of the adjusting nut 12.

The reciprocating member or ring 17 in conjunction with the rotatablemember or sleeve 13 by which the same is controlled, constitute a quicktension-adjusting or stretching device, the nut 12 merely adjust- 'ingthe stem 7 to bring t-he securin pin 10 thereof opposite the hole in thelade through which it is passed, before the latch is swung intoengagement with said pin. In Fig. 1 the dotted position of the slide 5and blade 11 shows the manner of manipulating the same for the purposeof attaching or detaching the blade from the pin 6.

Having described my invention, what I 1. In combination with a saw-frameprovided at one end with an open slit disposed in the plane of the saw',and with a recess intersecting said slit and inclined to the axis of thesaw-blade, an anchor piece mounted adjacent to the slit and providedwith a longitudinal slot and sliding transversely of the saw, a pin onthe frame traversing said slot, an extension on the anchor adapted to beprojected beyond the frame with an outward movement of the anchor, meanson said extension for securing one end of the blade, and means on theopposite end of the frame for securing the opposite end of the blade. 2.In combination with vided at one end with an open slit disposed in theplane of the saw', and with a recess in tersectng said slit and inclinedto the axis of the blade, a slide embracing the sides of the frame andmovable across the recess transversely of the saw, alining longitudinalslots in t-he sides of the slide, a pin on the frame traversing theslots, an extension on the slide adapted to be projected beyond theframe with an outward movement of the slide, a blade-anchoring pin onsaid extension adapted to be received by the recess, a blade secured tosaid pin and received by the slit with an inward movement of the slide,and means on the opposite end of the frame for securing the opposite endof the blade.

a saw-frame pro- 3. In a saw, a quick-tension device comprising apolygonal stem adapted to be coupled at one end of the blade, a nut onthe opposite end, a non-rotatable washer on the stem provided with apair of peripheral shoulders spaced a suitable distance apart, a sleeverotat-able about the stem between the nut and washer and terminating ina polygonal-head provided with a nger traver'sing the arc between theshoulders on the washer, a non-rotatable ring within the-` sleeveslidable along the stem and provided with a high-pitch spiral formation,a corresponding coperating formation being formed on the inner walls ofthe sleeve, as set forth.

t. In combination with a saw-frame terminating in a slit disposed in theplane o'l' the'frame, a transverse recess intersecting minating in aslit for the. blade, a recess intersecting the slit,a slidinganchormember for the blade operating transversely of the saw, and meanson the anchor for securing one end of the blade, said securing meanstraversing the recess.

In testimony whereof I aiiix my signature, in presence of two witnesses.

ALBERT C. HUFFSCHMITT. Witnesses:

EMIL STAREK, FANNIE E. WEBER.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner ot Patenti Washington, D. C.

